Elevator attachment



W.. E. NIGKERSON.

' ELEVATOR ATTACHMENT. No. 357,938. Patnted Feb. 15,1887.

WITNEESESV A I INVENTDR UNITED STATES PATENT OFFICE.

IVILLIAM E. NIOKERSON, OF CAMBRIDGE, MASSACHUSETTS.

ELEVATO R ATTACH M ENT.

SPECIFICATION forming part of Letters Patent No. 357,938, dated February15 18%.),

Application filed November 15, 1886. Serial No. 2l8. S93. (No model.)

To all whom it may concern.-

Be it known that 1, WILLIAM E. NIoKER- SON, of Cambridge, in the countyof Middlesex and State of Massachusetts, have invented certain new anduseful Improvements in Elevator Attachments, of which the following,takenin connection with the accompanying drawing, is a specification.

The object of my invention is to add to any elevator a device whichshall give additional security and not impair in any way the action ofthe elevator or of any of the safety devices that may be in use on theelevator to which my device is to be applied. This object I at tain bythe mechanism shown in the accompanying drawing, which shows twocylinders, one in elevation and one in vertical section, the twocylinders being of the class called oscillators, and have theirpiston-rods attached to a single crank-pin on a pulley or drum,aboutwhich a. rope passes, said rope being attached to the carriage of theelevator as a sa1'ety-rope. The two cylinders are filled with somefluid, oil being preferred, and have piston-heads provided withescapeorifices, so that the said piston-heads may traverse from one endof the cylinder to the other, but with a gradual movement, so as tocheck the free delivery of the safety-rope about the drum, and throughit to prevent the elevator-carriage from descending any faster than maybe safe, even if all of the other sustaining devices fail.

In the drawing I have shown one method of putting my invention inpractice, which I will now describe.

A represents a drum about which my safetyrope passes. This rope may passdirectly to the windingdrum ofthe elevator, or it may be coiled onto thedrum A, and the drum A be operated by the engine. If desirable,thesafetyrope may pass one or two turns about the safety-drum and haveattached to its end a counterpoise.

13 represents the frame to which the other parts are attached.

The drum A has a shaft, A, and crank G, in which a crank-pin, G, isinserted.

E are two oscillating cylinders, pivoted, respectively, at H and H.

The piston-rods D and D serve to connect the piston-heads (one of whichis shown at P) to the crank-pin C, so that the drum A cannot revolvewithout causing a backand-forth motion of the piston'heads, and as thesepistonheads move in tight cylinders filled with oil or other fluid therapidity of their motion is limited to the speed desired.

The piston-heads may be constructed to fit loosely, and thus allow theinclosed fluid to pass by between the walls of the cylinders and theedges of the piston-heads, or the pistonheads may have orifices to allowof the passage of oil through them.

To compensate for the loss of fluid in the cylinders I attachimmediately above the cylinders oil-reservoirs K K, which have a surplusof oil which will flow back into the cylinders in case it is required.

I claim The combination of the drum A, safety rope, crank-arm O, andcrank-pin O with the oscillating cylinders E E and pistonsDD', alloperating together, substantially as described, and for the purpose setforth.

XVILLTAM E.

Vitnesses: A

FRANK G. PARKER, lliIATIHEW M. BLUNI.

NICK ERSON.

